Puppet 4 deprecated the ipaddress_eth0 fact, and moved it to
$facts['networking']['interfaces']['eth0']['ip']. Facter will still
resolve it at runtime, but STRICT_VARIABLES sees it as being gone, so to
continue to satisfy backwards compatibility, we should remove
STRICT_VARIABLES from the test run.
Puppet 4 deprecated the ipaddress_eth0 fact, and moved it to
$facts['networking']['interfaces']['eth0']['ip']
. Facter will still resolve it at runtime, but STRICT_VARIABLES sees it as being gone, so to continue to satisfy backwards compatibility, we should remove STRICT_VARIABLES from the test run.